Imagine yourself in deep sleep. Very deep sleep. Unaware of your surroundings, unable to control images built from memories, unable to distinguish your dreams from impressions originating from the outside world.
At times, following a gentle sleep cycle, your consciousness slowly raises - almost up to the point of waking up. At these moments, the outside world is more perceptible, you're vaguely aware of what's happening around you.
But not for long, because you gradually sink back to the realm of subconscious deep sleep. - Peter van Cooten